SpringBoot中使用定时任务schedule详解

package com.example.springcrontab;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

@EnableScheduling
@SpringBootApplication
public class SpringCrontabApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringCrontabApplication.class, args);
    }

}

package com.example.springcrontab.config;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @PACKAGE_NAME: com.example.springcrontab.config
 * @NAME: CrontabConfig
 * @USER: MrWang
 * @DATE: 2022/4/11
 **/
@Component
public class CrontabConfig {

    public int a = 0;

    @Scheduled(cron = "*/5 * * * * ?")//设置定时任务执行时间每5秒执行一次
    //@Scheduled注解用来设置定时任务执行时间
    public void crontabDemo(){
        a+=100;
        SimpleDateFormat sm = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String date = sm.format(new Date());
        System.out.println("时间："+date+"   "+a);
    }

}